help me plz!

ok here the -3 is throwing me off, and do you also subtract the numbers, for example 3a-1a, 2a, i would think so right? could someone please show me the exact steps to do this?

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Find the inverse of , yep this is embarassing to ask, but i really forgot how to do this.

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Given that for all , find the ratio
Hint, the numerator factors.
i don't get this one, like i did t^4 - radical (t^4) all over t - radical 3
thats where im stuck.
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State the coordinate of the vertex of the parabola ,
do u use the quadratic equation??
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Find the equation of the parabola whose vertex is at , and that passes through the point
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Given that , , , , , and , what is